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@article{CMH_1984__59_139979, author = {Micheal Dyer}, title = {Subgroups with projective abelianization and trivial multiplicator.}, journal = {Commentarii mathematici Helvetici}, pages = {333--340}, publisher = {mathdoc}, volume = {59}, year = {1984}, zbl = {0545.20025}, url = {http://geodesic.mathdoc.fr/item/CMH_1984__59_139979/} }
Micheal Dyer. Subgroups with projective abelianization and trivial multiplicator.. Commentarii mathematici Helvetici, Tome 59 (1984), pp. 333-340. http://geodesic.mathdoc.fr/item/CMH_1984__59_139979/